Re: Dancing Weapon
I would do a few things differently. First, I would not sell back the Running and then buy, "Flight, only near the ground". Floating in the air is just a special effect, in this case.
Second, I would build it as an Automaton. Add, "Takes no STUN" and, "Cannot be Stunned". Since it's an Automaton, it's immune to Presence Attacks so it doesn't need extra PRE. (Of course, it also has no EGO so you can't sell it back. It's a wash.) Selling its INT back to 0 and adding a Computer is a possibility, but I'd have to think about it.
I doubt it would have a full complement of senses. You could probably take PhysLims for, "No sense of smell/taste" and maybe Touch as well.
I'm not sure why you gave it Concealment - can it hide itself?
It will run out of END after about 3 turns of combat. I don't know if you want that or not.